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Re: IDE Channels
a_van_belle
--- In MSG-1@yahoogroups.com, "Alan Sewards" <alan.sewards@c...>
wrote: Hi folks,is, can writing to disks be done simultaneously on both channels, and canone channel be reading while the other is writing? I ask this becauseit has implications for single machine MSG-1 systems. I went to sometrouble to set mine up so that drive C: was on controller IDE 0 and drive D: onIDE1, drive C: has the programs on it and the system, and drive D: all the MSG-1 stuff including raw data and images. I don't know if it has helped ornot, but now I have a good reason for wanting to put both C: and D: on onecontroller and wonder if I will lose performance as a result.Hello Alan, Theoretically using two separate IDE channels will give better performance. But because the mechanics in your drive aren't up to handling data that fast, in practice you won't see the difference. For example, UDMA133 can handle up to 133 Mb/s, but a fast disk won't get close to the 45 Mb/s random read. So on a single channel there is enough "bandwidth" to handle two disks "simultaneously". But be warned, speed can drop drastically if you place a fast disk and an older disk (UDMA66 or 33) on the same channel. The channel is then fixed to the lower speed ! The same applies if you place a non-UDMA CDROM/Writer on the same channel together with a fast disk. Only on high performance RAID (RAID0 or stripe) two hardware channels give better performance. In RAID0 the controller splits data in two portions and writes simultaneously on both disks. When reading data it reads the "even" part from disk1 and simultaneously the "odd" part from disk2 giving a 100 % performance increase. Placing 2 disks of 40 GB in RAID0 will give one virtual 80 GB disk. Disadvantage is you need a capable dual channel controller and if one disk fails, the data on the other disk is useless. A very good freeware tool to test disk throughput is Aida32. But never use the write test as it will overwrite all data ! http://www.aida32.hu/aida32.php Greetings, Arne van Belle
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Re: snow images
ltn_wx
It's important to point out that I'm a complete rookie wrg to MSG
imagery interpretation. Nevertheless, Robert was kind enough to forward me a jpg which I've been pouring over for some while. Comparing Robert's excellent image with accurate terrain maps my humble opinion is that the features to which he refers are mainly topographical. Noting the time of capture, could some of the features be shadow from medium/higher level cloud? As a complete novice, I look forward to being "put straight" by the experts :)
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Re: IDE Channels
--- In MSG-1@yahoogroups.com, "Alan Sewards" <alan.sewards@c...>
wrote: Hi folks,is, can writing to disks be done simultaneously on both channels, and can one channel be reading while the other is writing? Alan, I wish I could be sure, but something at the back of my mind says no. Possibly, two control operations can take place at the same time, but not two data transfers. I recall there is only one DMA channel, but two IRQs (do I recall correctly?). The situation is a little complex on the single PC system. The tellique software needs to assemble segment files from the DVB stream, and write those files to disk. Asynchronously, the MSG Data Manager will read the Tellique files from disk (or the cache?), and write data to memory (except for the raw I/O case where data is written to disk). At the end of the scan for each channel, the data in memory will be written to disk. So I guess the raw segments should be kept on a separate drive and channel for optimum performance. But what are you really trying to achieve? I would guess zero missing segments. Therefore the system should be optimised for the Tellique software and everything else picks up what is left. Oh, and all of the above assumes suffcient physical memory that paging does not occur. Just my ramblings - I'd welcome thoughts from others... Cheers, David
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Re: IDE Channels
Guy Martin <agm@...>
Alan,
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That's something I've never been asked. Looking in the book at a Gigabyte GA-7NNXP motherboard. This board has 4 ide connectors and can be used as a Raid 0/1 if you wish. The book says ' Supports concurrent dual ATA 133 IDE controller operation.' Looking at a non-raid m/b there is no mention of this and I would probably think that the answer is no in that case, the controller switches addresses to the device it wants to talk to, but I'm willing to be proven wrong. Cheers, Guy
----- Original Message -----
From: Alan Sewards To: MSG-1@yahoogroups.com Sent: Thursday, January 29, 2004 4:29 PM Subject: [MSG-1] IDE Channels Hi folks, Does anyone know if the two IDE channels are independent? That is, can writing to disks be done simultaneously on both channels, and can one channel be reading while the other is writing? ---------- http://www.gordano.com - Messaging for educators.
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Re: Meteosat 8 - Meteosat 7 co-channel interference
--- In MSG-1@yahoogroups.com, "Alan Sewards" <alan.sewards@c...>
wrote: [] Re missed segments on 28/1/04, I had the same ones missing at1930, 1945, and also had 2215, ch 12 segment 1 missing. Could have been wind, as it was strong last night. Alan, for what it's worth, my report was: Missing HRIT & LRIT segments report Cycle: 1845 HRIT ch 4 seg 2 (only on one PC) Cycle: 1930 HRIT ch 8 seg 5 (on two PCs) Cycle: 1945 HRIT ch 4 seg 3 (on two PCs) Cycle: 1945 LRIT ch 9 seg 3 (on two PCs) The last three segments wer emissing on two PCs, and were also reported by Eumetsat, so perhaps there were problems with the uplink. I run the Setup4PC program continuously, and no uncorrected blocks were reported. Thanks for the comments on interference - it was suppose to be one of the potential problems, and I was just interested to know if was no longer a problem in practice, as it should no longer be a problem in theory! Cheers, David
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Re: Meteosat 8 - Meteosat 7 co-channel interference
Alan Sewards <alan.sewards@...>
Folks,
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As the SSPA slated to provide the power for the MSG-1 user downlink on 1691 MHz or so is defunct, it seems most unlikely that MSG-1 is radiating anything that might interfere with Met 7 WEFAX. There will be lots of other signals being radiated from the satellite such as raw data and continuous telemetry, but these are likely to be in other frequency bands. In any event, the Eumetsat ground station will have a large enough antenna to ensure that it can only see one satellite at a time. The Ku band TV dishes we have been using for the MSG-1 trials are irrelevant, as they are looking at Hotbird and not MSG-1. FYI, the 3 dB beamwidth of an 88 cm dish is about 2 degrees. Re missed segments on 28/1/04, I had the same ones missing at 1930, 1945, and also had 2215, ch 12 segment 1 missing. Could have been wind, as it was strong last night. Best regards - Alan
----- Original Message -----
From: "Peter Benney" <tugboat@gotadsl.co.uk> To: <MSG-1@yahoogroups.com> Sent: Thursday, January 29, 2004 10:27 AM Subject: [MSG-1] Meteosat 8 - Meteosat 7 co-channel interference So with Meteosat-8 at its operational 3.4W position (according toD avid,
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IDE Channels
Alan Sewards <alan.sewards@...>
Hi folks,
Does anyone know if the two IDE channels are independent? That is, can writing to disks be done simultaneously on both channels, and can one channel be reading while the other is writing? I ask this because it has implications for single machine MSG-1 systems. I went to some trouble to set mine up so that drive C: was on controller IDE 0 and drive D: on IDE1, drive C: has the programs on it and the system, and drive D: all the MSG-1 stuff including raw data and images. I don't know if it has helped or not, but now I have a good reason for wanting to put both C: and D: on one controller and wonder if I will lose performance as a result. Best regards - Alan Alan Sewards email: alan.sewards@computer.org web site: http://asewards.free.fr
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Re: EKU
Mark Broddin
Pat,
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According to Mr. Marc Christiaens, licensing officer of Eumetsat in Brussels, the paperwork will be send to trial users next week. Regards and groeten Mark Broddin 2531 Boechout Belgium
----- Original Message -----
From: "on4aao" <pat.on4aao@village.uunet.be> To: <MSG-1@yahoogroups.com> Sent: Wednesday, January 28, 2004 10:33 PM Subject: [MSG-1] EKU
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snow images
Robert Moore
David loaded a very nice image of parts of the UK under snow. I was just looking
at my own 1530 HRV image today and noticed some lines in the snow, for example at 51.8N 1.3W and elsewhere. I suppose some might be rivers where the snow has melted (or not settled) in the zone around the relatively warm water. But others seem to be very much in the position of motorways .... surely not? Puzzled. Robert Robert Moore tel and fax: 44 (0) 1352 714456
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Re: Payment
Guy Martin <agm@...>
Same here,
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Guy
----- Original Message -----
From: ltn_wx To: MSG-1@yahoogroups.com Sent: Thursday, January 29, 2004 3:01 PM Subject: [MSG-1] Re: Payment I can confirm that the credit card payment facility is now in place, having just done it effortlessly over the phone. Yahoo! Groups Sponsor ADVERTISEMENT ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To visit your group on the web, go to: http://groups.yahoo.com/group/MSG-1/ b.. To unsubscribe from this group, send an email to: MSG-1-unsubscribe@yahoogroups.com c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. ---------- http://www.gordano.com - Messaging for educators.
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Re: Payment
ltn_wx
I can confirm that the credit card payment facility is now in place,
having just done it effortlessly over the phone.
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Re: EKU
Luca Bertagnolio <lucaberta@...>
Pat,
--- In MSG-1@yahoogroups.com, "on4aao" <pat.on4aao@v...> wrote: Has someone had any experience yet in obtaining the licenseI have tried sending an email to a couple of contacts at IRM-KMI, but no reply. I then printed that same email and sent it via fax to the same people, but still got no reply. This all happened in the last two weeks. So far no signs of life from Mr. Marc Christiaens... More info at: http://www.meteo.be/IRM-KMI/francais/index.php?doc=Afdeling2FR http://www.meteo.be/IRM-KMI/nederlands/index.php?doc=Afdeling2 Best regards, Luca Bertagnolio IK2OVV - ON4OVV Brussels, Belgium
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Snow covers the UK - the view from Meteosat-8
Here is an image from today using Meteosat-8's High-Resolution
Visible channel and 10.8um thermal channel: http://www.david-taylor.myby.co.uk/software/msg_dm.htm#sample It was processed by GeoSatSignal into a polar stereographic projection. Cheers, David -- Quality software written to your requirements Web: http://www.satsignal.net Email: davidtaylor@writeme.com
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Re: OT - new rx computer
Hugh Marnoch
One of the hazards of living in the Highlands, or Mars as Dabs like to
think of it ;-) --- In MSG-1@yahoogroups.com, "Guy Martin" <agm@t...> wrote: Most we got charged was £8 and that included an atx midi case,usually about £5
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Dishes
Douglas Deans <douglas@...>
Just to confirm what Ian has already mentioned in the SatSignal group.
I have been using an 80cms mesh dish for MSG (and previously ATOVS) without any problems. It is an ex-SKY analogue dish (Scotland needed 80cms for analogue), dark grey....perfect. Regards Douglas.
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Re: OT - new rx computer
Guy Martin <agm@...>
Most we got charged was �8 and that included an atx midi case, usually about
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�5 Guy
----- Original Message -----
From: "Hugh Marnoch" <hugh@marnoch.org> To: <MSG-1@yahoogroups.com> Sent: Thursday, January 29, 2004 11:27 AM Subject: [MSG-1] Re: OT - new rx computer Also recommend Ebuyer, prices are good, delivery is swift and cheap, Dabs are good also but the gits want �25 to deliver anything to me. *********** REPLY SEPARATOR *********** Message: 4 Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/MSG-1/ To unsubscribe from this group, send an email to: MSG-1-unsubscribe@yahoogroups.com Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/ http://www.gordano.com - Messaging for educators.
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Re: OT - new rx computer
Hugh Marnoch
Also recommend Ebuyer, prices are good, delivery is swift and cheap,
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Dabs are good also but the gits want 25 to deliver anything to me. *********** REPLY SEPARATOR ***********
Message: 4
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Re: Meteosat 8 - Meteosat 7 co-channel interference
Lawrence Brown <lawrie@...>
Hi David
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No problems with Meteosat 7 channels 1&2 Timestep System with 90cm dish. Cheers Lawrence Brown lawrie@g4wsn.freeserve.co.uk
----- Original Message -----
From: "David Taylor" <david-taylor@blueyonder.co.uk> To: <MSG-1@yahoogroups.com> Sent: Thursday, January 29, 2004 9:03 AM Subject: [MSG-1] Meteosat 8 - Meteosat 7 co-channel interference So with Meteosat-8 at its operational 3.4W position (according to
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Re: Meteosat 8 - Meteosat 7 co-channel interference
Guy Martin <agm@...>
Assuming Met 8 and Met 7 operate on the same raw data downlink frequ, Eumetsat's dishes are obviously large enough to have a beamwidth of less than 3.4deg.
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The raw data downlink for Met 7 is I believe on 1697Mhz and Ch1 & 2 on 1691 & 1694.5, so no co-channel there . Cheers Guy
----- Original Message -----
From: David Taylor To: MSG-1@yahoogroups.com Sent: Thursday, January 29, 2004 9:03 AM Subject: [MSG-1] Meteosat 8 - Meteosat 7 co-channel interference So with Meteosat-8 at its operational 3.4W position (according to very recent Kepler data), is anyone seeing co-channel interference between the two satellites, or does that possibility no longer exist now that there is no direct dissemination? What about ranging? BTW: I missed a few segments last night - don't know why. Cheers, David ------------------------------------------------------------------------------ Yahoo! Groups Links a.. To visit your group on the web, go to: http://groups.yahoo.com/group/MSG-1/ b.. To unsubscribe from this group, send an email to: MSG-1-unsubscribe@yahoogroups.com c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. ---------- http://www.gordano.com - Messaging for educators.
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Meteosat 8 - Meteosat 7 co-channel interference
Peter Benney <tugboat@...>
So with Meteosat-8 at its operational 3.4W position (according toD avid, I am receiving Met 7 Wefax using a RIG yagi with no interference. http://www.polarorbiter.co.uk/D2.htm BTW: I missed a few segments last night - don't know why.Missed the following 28/1/04 1930 Ch 8 Seg 5 1945 Ch 4 Seg 3 lrit Ch 9 Seg 3
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